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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dad3bab84e4ae2b571e7ee38c67821016c88c51c7d633dd8145535ddcf3cad' 
  AND token = 'F3QdhImRUQABLs2KFqLz5tqsiytnvRm2gcJIm7fP79U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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