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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275d56a8acfc696c23eefe305d904170c980308b3d8b4238bcf5d99865259442' 
  AND token = 'gmMR5KQ6J19eCNzPuF4hVjw8oqDz50ExBQoaz3enjqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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