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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa98e15385760d3fd1d17e5ddc989e8b56dfa245a708e90315ec695e9c426f0' 
  AND token = 'qZ8PqXRrFU95eVqsowYkx5gbGb1T/n1L9mQ0Q5QW9AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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