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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18356cc433ee93c2fda44e2b4cf78feb5197f76705684fc118c4af972459b28d' 
  AND token = 'wv3ymt/u83qKqcinp4Xeo0rY17V/ldEGO0PAUD47a9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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