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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4eb3c61ae13a40d56f28ce201404c7b8c67be71912311d72f67bbd731406c6' 
  AND token = 'CkLwm02naRvSXcOZkCLhVD8/pHsWgg98NgIWbFSD/Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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