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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b64fbf88a4cc495f45e2bc668b4a3f0b5e45cd7b97d70c6bce940acab4ccf96' 
  AND token = 'lJa38Jv/edURKcc834joYf3q56Cuo/Afih6MlwHcVrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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