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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b06a9ba208e174226330e8c6fbe7e54323b4d9d59bd7bd920d7cb10b48ec7cb' 
  AND token = 'sOWzrvZfTTLJc8aXia6jW6r3h9EJzoJEV/vpbsNOlog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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