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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab72ea83f8747b77c455f8fc571ede993ed88a73001d69667604d5678d1fad6' 
  AND token = '7dwrSwtpLoLDWH8STg8GTs0dPFWAxudIB/daS6L7gQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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