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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9518cff9b7bce0fb6b98f8d3ddc0566f1d80e3c32ff5c0016d390d56c74d7b0d' 
  AND token = 'SYlkTkxrpG2jQk8Zo7B/oWCWn8oPHTEfGPNqRyMXD8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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