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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd76e619d6ed72c0b6edd38dd1dfb31438bc00cca18ea422821036f60662e9a' 
  AND token = 'FLlxv8IaW/sBNl4MyhbrMsLIlMwxD2p97Ie3tkw8qj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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