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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5d62bac4de4c035b08c5a68bb61fa4c5bba5bca3c45739a1904aee94a7665a' 
  AND token = '6Cbnsv6U7syCg/Absmcu68tLwE7xL9GnanFbkdpZQ3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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