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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741f72dcd9c1517c53a5680e6a1666e809167029aaddcf2a8c237640d6c66fcd' 
  AND token = 'kT4DAmU+chsDHc/s9d7vf56l+AvSrLQZxTkMV83iLto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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