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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76226673d0ac15f2699cea826a9e96ecbc60c2cc5835cf40efe7f058709c7824' 
  AND token = '3VYjS4rV0z6P9D26iTvWAz0ru3+LhCG9sjzBglkbSz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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