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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2d3aa9172d68fb1934601cf56e168f312bc3ab35ed92764b2aa25b8bcbb448' 
  AND token = 'fS5kvsDbqu4ZUMZOvJyA7QcjOa5w9VFjyVn755lAHG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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