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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ea5914199ac5506a3c024f9eede9a711a75c6cd39377731751dc5e02abe5aa' 
  AND token = 'vyTW/oC/Pwvi2tlnM/47aZX/cGjTJaSSfWpOMtj9Xh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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