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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9829d596d5c83c16b03e59ce8a04f657988c36ed135cc884751246d63b2e2f8' 
  AND token = 'U/WAlz+Nhn5CzJJAukVE9ICdas5qUQok5rKjW2aOFnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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