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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d67d6af54e5da5621b16a77516fa76e8f3490d5dc9ac932b6fe841785ef7d63' 
  AND token = 'roTeT6vZkKVecZ3pS4bq6GQZtt+6Abti+0pUCr6qrZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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