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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7c86b86810047c660d522d1888d4414a5dde95bebb390a825ee91f1af0ee5c' 
  AND token = 'ASnaAhd8GwJU7NmYEVyPldY4posuVK2uFAnNB3INkQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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