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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7641b8ce4dbf93cf348f26230ee4f062ba31f76a43e8dcb9fa08cddbf759f5' 
  AND token = 'vmcNbUHiR6AHi9WM1mIc5/o244DrIxSOsCaDFIrfv7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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