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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d710c252a6a7ac9a9d2a65ed317449fc03ebdaaf5bf076f7652f10f6cc4523' 
  AND token = 'zS5RYjErFyIGIh2CV4FGVaueqT9VH1+mZU1QBsyF5wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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