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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ea2f329d1bace7ff1ae92755619eef219806657e1a03fecc2c7213e71044ed' 
  AND token = 'LQNQV+FcGr1ggnacR8iaAmf60v9Kx/4XEp7cXnE4OiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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