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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a75409de670e22777718535957c0ddd068916334167271a9b8e9b0d2988f110' 
  AND token = 'lc0W3XukioA1KyFPCSHT+Fds9IatZbHgEKNG27N7K6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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