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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba26ead8e118c79f3dfed8e38218cc012142dd6c25bfed94669667d696b56ab' 
  AND token = 'cJuWtM/9OelIT+GdZR7ZrJrPg6c68X7zp8xSSHSvEIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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