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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430a9bd56394fe3a6d7474e21a6a694d0f2fe2a32dea440c70a5be54f479752d' 
  AND token = 'pPKhzY5nUbNy5ab8KXHj4JfH7U/8sAzg2DFjCMCmHMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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