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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e644e34ec2dc314f84c84a8381cafecb644acba81ef51153c46c4981302fec9' 
  AND token = '+XPPg3zPcaGksgCCVWJ8TT8/wGJ8uXLwe/GrwEygWyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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