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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715525ea9f822a2b6af0a5241920f1717bc0b58df4d0e899cf02ad9778a892d2' 
  AND token = 'CxWUJfSpXVpsW1fenbYoLtYwFXWmYAjTZiY/QAichYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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