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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b05e669c220bc6147304ad3833fa0e0aa7cfd1be2c8be70b07790f5931b5255' 
  AND token = 'e0G/M1KNck86Ft0J1hJFPbcUdbtpfmz7zZCnjjb96Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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