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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456b17484effd0d07ae09c5704448ee8f1b8dce9010e6cceb8ac3855904f69e9' 
  AND token = 'cskVTmv0zmE9al+6LM4hkg5fKtSf489XWdjrGoKJ2Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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