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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5baa32adadf3fdaf5645673120f5c40f5b4560e39c029b980a555483a598d93a' 
  AND token = 'XyoQ+pDGt00N30VgJzShqCF0HA6I/Dwi+68sWMiINCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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