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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129fdd89cf1d685e6568928d67a7bd9ea10d39e064d38b82f0bb8def8db81006' 
  AND token = '1JPHVdtvxNJ5X8ZkffNk5Cini7mMIPuScCbMtViolDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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