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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9ebb6bf65c7d23cfd81c960183e509079b107e930627f22c1a093c23493d4f' 
  AND token = 'ss//itDm+QFaBdqD567tEQ3JvdUqgq8VviaFXdh6nS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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