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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6933f5dadcb102be9feaca277024ade2312df815e6ad6793ba653ae7ff78e5c7' 
  AND token = 'mdlkLni4UVXmT8Ctyaf8mt20BXygcZM3I+fLN0ysQPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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