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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7363f92c23c82bb107b71f61b8158b6448807d7c1c68a89d2689ddc16611243' 
  AND token = '1mot6VYbD5wgPr6GcyVFSS8ck64lWLpbYi5ojrEC0+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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