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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48077d5a55ebcd22eb08bff2854d689fda70cb37130f942b50e235ba587b624d' 
  AND token = '2VayIJNN/5qun0LE5ctu5CAEFEnWgucMljZbFht95Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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