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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1b656048c8d82e2ae66c29b84bba152a3e5880245a8092e2cc130c35019c93' 
  AND token = 'vkafBS0ioDXTwXOLy3gupI+7u6FLtRM7hjiAwF3At6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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