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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e74f18d8f4e59e120e0c3ceee1bc64df9e4f742345b50e5159d966ca5f0fba' 
  AND token = '7hxndtNBgJTPPo0MHQvWslxHJMhrCYXElae4FrIU65o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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