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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b9989f4a30311757e262a393c88451a5c38057ea4ea762f23f4d482da3bad8' 
  AND token = 'Pnjt2itFoEfzjc7MJlF2lx2SLqXHZ1/4ISdJ4OJjo7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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