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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb9d517962911b4c9aaf1b41ab6a5f5598fbbd349bb694f2e9fd8579b4a4ad2' 
  AND token = 'TCa7rCtWPJhOMbQD/rhSfpV/oMTp4wRiJjeSNtSpLaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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