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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1c3ee8e843c48dece7b371f214a2ad44b759c1e8d76ff5de1036e9c46b388f' 
  AND token = 'lMycffiilxBoe0FoA6nEkeJ2fI+c+SCuDpLyUHA8saY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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