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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df77e45590320bb9d6d1357b9d7a4e7a3a470e69b6b5ad2870a3815a7f0ba75' 
  AND token = 'ttzlCypzKg7qxwRzA14Evzqv0HOsPQjNYxMp6kLSAQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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