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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad788a20175df4c7c467686ff97c0e399a13eb58504f5fd88a7ea8707679a97' 
  AND token = 'pkwZH0WRzU07zPaeFzbKwIODImyq7VhjSKyZUzkmruI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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