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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7ba3669c1802f0ca59ba0b8f4caa601de8bd6c4a811e7f175ec01db53bdbcc' 
  AND token = 'aecBDsoi3/64JY9vEsIhPqEGBo5SW1myFwvLGYLMpeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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