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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d891f47685d1e87a5f87cd6df5f73ac2b2a33a12fceede952af2e9ada38edd' 
  AND token = '9ax9geVn8ppavE5SRVzPUefzYY1fMXN9qFVX6TiGswc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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