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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33807c204544e075ed1c1c8f03952be02e135bf0aec7a4db02cf07488b3289fc' 
  AND token = 'ABFblGWSRDwCOQjGRQN1AFNHGvWhwCjfFBFokSx1Ook=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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