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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5006f04200964f7aee6193efdbec0eee8efae2a4cee9c644dde073bd6d4547e' 
  AND token = 'sqCOrJ5mHRSWnAmHmtb8ZbXZh7QyBygL6VmexG+EuOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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