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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c4b984527c636ef7bc168363a2299d55c7db9f4f963c96175d9b914cd2d82b' 
  AND token = '1eqdarmB5c11Mp5xZd3VwLq0tMmpndmsttD4Z/g/kEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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