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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8e6be048f9d906b0321c070bd5936cb57b1fed98a39fd0f3c5169f04d897f9' 
  AND token = '4xMMuSj7HleyWCj2igJX6kX2fCh6rsWkD/zzPQnjRk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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