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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7aea4f1a7089aa91188af73e593a824f2b135420dca65ae393dc930387d8f62' 
  AND token = 'N9xfUV9HhSj5DVI5gm/QkkGyp0a4kJpBI5MRa9u/fvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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