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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e7ec1d1435e2439aedf22c3b9cce55102ba3816c4cf5a0c5b1ea4c6abf0b32' 
  AND token = 'dMS7POGraX1BXzTyl6B4nIx4sX3LkZ1h9VO0s7yTqQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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