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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e5fb61af3bc809390059d4fcd77ea71a0e6e6432c3fa92e114e9e9a4845c62' 
  AND token = 'GCaRkCKLyDlCQiKvj5ah46ZfSD/V1sOGfad9U8CdETY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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