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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23d1c2c242ab21a925665ac9aad27f8ab889d431baf0b4bf99daa7b27b1babb' 
  AND token = 'y5hu8YFk5K3HRYCQrf142J2p9Q3x+SNTpmjriafR+rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}