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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c787b66755cb60a807b89f2984d8a522b423d833af0523a643d3170c622a44f3' 
  AND token = 'SL4bscfOHekhD9bc0+vPKqc+TcWF4y1eajWlIXfK/S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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