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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55da16029193c75fd3638bf4d0155e0c4c0a1e938757c49976523f361fee0554' 
  AND token = 'fZKULaMRynx+tQH26bRKhZu6Xt01KTVge0+ox+jwj/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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