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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be8bfc4719ebae41e59cf391b9d0af6fbc8b3b61faeacfa75b9ac6389100a8d' 
  AND token = 'U9GJxffCJuBkyyoscVPcIHGoZF52sA9Bm2ISwuC2MrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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