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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d69082ac525d8e64f8f414799661b97446bc548c22cf98d69cc4fdb73440432' 
  AND token = '1hH3B8YlzLQghfcresSE0cIGa5YPtp/amEOk3pr8sWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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