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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f79c031f73c649fa412a99ae6a13654ffa4cc7c4aee7dfb7b824f4d581ca85c' 
  AND token = '8YbyKWR430vS/6Hqieae7xm4FDnwaxdxyGKcJC58mCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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