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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aad9c98c6a455c3fdaef4299d9cebbb43f5409bc6def23b8f99de0cc4eafca2' 
  AND token = 'X8o0m0zZjgK60//a9K56Ng8De7wehEXl1eQz48fdCbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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