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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a4743fddea7d46b12cef30cf9b9a6a95c2118edd4bf1f08ee05a8f26b16f1f' 
  AND token = '5o2cTYWlEhcjdcg9d5AIg9n2XCJN5FFj2+SPkedzF1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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