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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c468c817f131e73325887a0c009a5ea72ca0902ef93237e8cfbcf9a9618f4feb' 
  AND token = 'rpATZLiALqq0udtMh9XzpJu0jErw16wTtxzjcFwXUyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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