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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf41a08cdff5a89a426a8cad7ae962c32eac86b7a692cb69aba96505dd17a6a' 
  AND token = '2JTIP/jU2R7Lcgpcob7gO0GZ8RJbDxkmZlogfW9/mK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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