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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f06442e616cb3345fbfe2fd9cb5652377d85f36965f2d7f72f79e99b9d9085' 
  AND token = 'GfkehYMMC/xr3YpK9kHFI1i80hQzSdrSgnFUn416GzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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