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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ba155661ae9d8b7e4c977ad3371e81d08d425bb2da1c48b6ae9adac7f6051a' 
  AND token = 'qyFUtPUXOJqLuXaNvqexIdvWi96pfg9sVz+Lr/si45Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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