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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc550530b647800e5df5db9bb8b8b8e6bacbe24d29cc3868855b6c5f6f8d3b88' 
  AND token = '/YrmxTkFuCcjLIL7TkH2OaHJujYsgQbvOuwKiI+kNkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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