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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b5dc5166d7d0c7dd655f8d35d235defce6973705049983ebcecd2a2b153ee4' 
  AND token = '+DYbqJ/xQvwWR9BKeJi47SJ1SFxqmobccSZe2Q22jcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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