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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e541db1bfdec20cf5e90fb980a6e1861a235e86b6c22bd281e24b7b98c80c4' 
  AND token = '0IeeFZYKskI3k9QczUB3HNoAReT1iT9TwXa9DeDrEWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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