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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87b64319c3976b9684cf9710cd341a530d3f14388a2ffccfbad818a497fe41d' 
  AND token = 'G82MeX5Xb95FKuf4DRYGuKxzvufdi84qaqrvLpmGEaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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