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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682ee590b40026bcf2a6d63085b952199e9745cf70e9b6d4a06e178178f0edcb' 
  AND token = '+rJlGl/jUvBLS4f81Mp5nkUf3kqFG4LVAx73NHWHjp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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