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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3490d0e50e13c07086a6891d9a8b42530c718368ca72231c50d2929aabfb24' 
  AND token = 'l2VdhvdoyAk1SLIB9qleJcByfsQdVWcw5ueY7YpT3B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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