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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08734c95b18aa57a727e42cbfd78c2ed050af317ee80b6f576f5f3877c73502e' 
  AND token = 'v+120RaYl2mUD5q+gBs7c5ffWG/E13DoEbITtN/B/VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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