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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b04405cc16b06df47a392ec2e9e40307d1ca3b549576aa8e77cc41ab2111c39' 
  AND token = '8fA6BIzfHoIHFDcCxiev5JpevG6WoOpe0bpb0K6WnPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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