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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db72ae6cca4137ecda69e167b0c49a6ca5fe7600cecdc5977c89832a2f50f21' 
  AND token = '/70Om++Bc/HlYiUO2s+cEwVQ3StsxxMnCPWlJSeRw6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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