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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f77d92e3e8fe2834b9150149fc0df9c693f79d937a6815ad5adda99f2ed3201' 
  AND token = 'JGo+63WNr9GqG/FkbIH/Jsi8EkR/+BTpSySTemRbYNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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