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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076490106d37e061e99a2da4eea6231b4cb11ad1a580898a3eb48ea4f205426d' 
  AND token = 'HTFM0lWAq9Dtzs5gdGltFEV4Yu9pIxZkkvP2VazkGS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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