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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c031e907c6f34a5c4c908b8021da2a8b3f4042926d0aba788d27297f4f56560b' 
  AND token = 'KwhCHnsRsd29Bv+jt64cJuftldyCQaZ9sZ2SOk8oBck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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