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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d067c45029b6ec1f2207f1d6bd6114c602c9d67baf32816805675c3faae5f0a' 
  AND token = 'Boau7YfnhfxdXCNZXS/jQqOYhXyCRgQ47njlSqSMT3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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