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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148199a898b12202ce42108924c07027e9c047b0dc0b7062d26aa3b6d730122a' 
  AND token = 'ZloHc2JJn7DZS+x2ac65d2jpU2IEJGbaxno/nqma8rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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