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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83e3cef31f999f49ab9e4a2db2c0f79ef7aad9a9d5d0170b84e22e8ee5213fd' 
  AND token = '+MYBZdCmTNShOznAY21D/hXFcVbuxiVOwPmwQUGmdgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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