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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060fe798659fa34f82e3f4f4930101a3e54f3d121e6ed0adf0322b43b78b3013' 
  AND token = 'c7JCsO899rw6ak1KzXQjwTvzyoVC8lPxdtv2W6W+Yks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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