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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939aaec7e6c6f22d58d2587767a0e1250f4308fd276ee12afd24d0833a45be69' 
  AND token = 'aZ2/rNNp20Q9C2l2skgPu77eo9abtabPFGo5D3+PfeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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