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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbf0ddc3dff34d219c720ed9574e325204a566400858fa83e9ab4eb1afdfc88' 
  AND token = '657Bcb8kT7ZEQmHK+kdXwPZa0Uu/XmKdQ1a52pCLMMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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