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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02622f88489ade9a805f6da926b8e0ea000bca3147aa643e3d62bb96374a97e8' 
  AND token = 'IRetKkjHlVU+X2Du+5ZJzEWDel3ndlmxJ29lBhg+L4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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