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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec02cb23afa1f01d90db31921f3a812dc7161a81212e5bee22f825c03bb8c56' 
  AND token = 'cqqGJgaj8pV3tPsRPn3HucZ+9sDNs2oYBwCTMptt8h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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