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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213a3eab2f4bb31b3a6c507ecc5cb4180a6ff38d29b2e914c9af18349904f227' 
  AND token = 'k6FaiUjE4y8ULMR1sECL+SVniBKGleJeGP0zZRo0ryU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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