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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99841390f4312aecbf186c75cc2457c51498067f62cc234cdb6177e2744977d0' 
  AND token = 'pVk8RHadFOnZ9kbyhnSdzFTFjA+bMMi35PRv1wYXoVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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