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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0046125b70b41a6d9ec1f7b5aa2dbd4e3abb96b3ea7b5b8b35c921ec58ca2c' 
  AND token = 'EKY08nhSDup+KC4vrhZrTjqOSZnJterdsfWfwRp1JA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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