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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cc9cfabb9aa5212ff6047dd5705f36b3c026d1b4615f5a21d3644562a55406' 
  AND token = 'lFKn0KNPYa3o8bEifroOPUHcFl9J5xj+fCACcAHDH+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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