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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fb89f57601ef360ea33a76748b6e6ecfcd82568a00375c456ab86d11498368' 
  AND token = '9XNzUtPG45lxLL3JqyB3059da2/wSA/oMXMW0/936cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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