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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9814e79b86bab170e337ca07e7093c4cee01a287085657a22ab23015c29e09' 
  AND token = 'mDlD/m4Z+2E8lQD5IrG0fqvF2ayCW5azrQI7cB/+kk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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