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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be3e44aa832df0e95c13a060f91084328977c4e8bb687e8a6faf641c098a9ae' 
  AND token = 'WfeKVEkMO+Ccb+nraUTtN0KwT/n4gSLdAnJf7GZGSWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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