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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da4f85ac62230fc5af3934836146acc7444e40509ac0bd41e4e99a186cf1935' 
  AND token = 'mvBkg1uaJjIwJspdJrsDMLpDX3x0EcO9LOEZRp4hqEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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