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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a1cc405dd9b56c3a2dea478681da048be1217ac9c55a3ac8707d77b6c68236' 
  AND token = '4js3FmvjNZU/6XAX6sIXe9iT8ceBzjltBUoQA8hNIao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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