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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f36b3ca4181438da42d2a5f4475582ea95008f572af7181ce9537c40a984da6' 
  AND token = 'TZWCDfURc2vpSTllupM+lYdiXGcv0UmsRq3qEjgB4ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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