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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7130f939f8e7fa076bd963837beb589e19d8f00145e43f867b0e6c2c285fa8' 
  AND token = 'idqU5r/8lMUXdtB27LJG2t9UAjP7BoM8xj0nwA2X710=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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