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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9ac05f24c8b987f7627da8f761da43276767f3ee97f4b1e248e0035e952376' 
  AND token = 'wI/oCK7gSl0eNDXTCFCb9aK14z34JU3V55hHRx0SYjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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