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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236389ffb9ba43c5544a7cf7582b6cdc76ec0baa19ab40578f62c0245032f56f' 
  AND token = 'FbKTDaZABUfVEhXU+ScVp+tcnQERIQ0MFpgTNqvQt4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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