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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883b7d67de93bab6656d799af1e39ef274b7706360d4117d3daad3c467601757' 
  AND token = 'nHK2Z6RuNiyZtyO2BpKFH7Cwprro90qCczDLE6f7CTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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